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An action potential occurs where the potential for the membrane of a living cell first increases before decreasing. It is a characteristic property of many animals, including muscles cells, nerve cells, and hormone-producing cells. Plant cells can also produce them. Neurons play the most important role in cell-to-cell communication. In the beta pancreas cells action potentials are linked with hormone release. Plasma membrane has special type of ion channels that are voltage-gated for creating action potential. These channels are shut whenever the membrane's potential remains close to that of the cell . However, If the membrane's current potential rises it opens the channels. When the channels open they permit an inward flow sodium ions, which increase that membrane's capacity. The fast inward flow of sodium ions results in changing the membrane's polarity and they stop functioning. The potassium channels then become active and the flow outward of the potassium ions . The result is that the membrane returns back to its normal state. The transient shift in negative known as refractory duration prevents the reverse travelling of the action potential. In animal cells , typically two types of these potentials exist, described, for instance, one via voltage-gated channels, and one that is produced due to calcium channels that are voltage-gated.

Nearly all cells show the same voltage between their interior and exterior environment. The cell's voltage is measured in milli volts (mV). The typical voltage for an animal cell is around -70 mV. The majority of cells show low voltage variations are thought as occurring, however in certain cells this is an expected characteristic. Certain cells may also exhibit up and down cycles as the voltage decreases and increases. The duration of these voltages can vary widely. In brain cells the up and down phase of an action potential are performed in less than a thousandth of a second while in other types of cells , actions can last for a long time. The electrical capacity of a cell in the animal kingdom is dependent on its membrane structure. Cell membranes are composed of an lipid layer and proteins. The lipid layer serves as an insulator.

All animal cells are electrically polarized due to a voltage variation called membrane potential. For neurons, dendrites, axons and cell bodies have different electrical characteristics. One of the most exciting parts of neuron is called the axon hillock but axon and cell body too can be stimulated. At the axon hillock the resting potential is -70mV and the threshold is at -55 millivolts. Synaptic stimulation to the neuron trigger depolarization which causes the membrane potential to rise or fall. A potential for action is created when enough depolarization develops until that membrane potential reaches a threshold value.

The action potential results on the activities of voltage-gated channels present in the plasma membrane of a cell. The voltage-gated ion channel actually a group of proteins which remain in plasma membranes and generates movement potential because it is able to generate the positive feedback loop. Membrane current is responsible monitoring the status of ion channels. The action potential is created whenever the positive feedback runs at full speed. The time and amplitude are dependent on the bio-physical properties of the ion channels that are voltage-gated. Numerous types of ion-channels are identified that generate positive feedback circuits that ultimately cause the creation of these potentials. They are involved in the production of high-speed potentials similar to those generated by nerve impulses. Slower ones , like those made by muscle cells are mediated by calcium Ion channels.The ones that have been the most extensively studied voltage -gated ion channels are the sodium ion channels participating in faster nerve impulse conduction.

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